Coffee-grader



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"13. RAKBSTRAW.

4CoH-BE GRADER. No. 261,041. Patented July 11, 1882.

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2 Sheets-Shee-t. (m Model) E. RAKESTRAW.

. COFFEE GRADBR. No. 261,041. Patented July 1l, 188,2.

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- UNITED STATES PATENT OFFICE.

ELAM RAKESTRAW, OF CAMBRIDGEPORT, MASSACHUSETTS.

QOFFEE-GRADER.

SPECIFICATION forming part of Letters Patent No. 261,041, dated July 11,1882.

Application IedApril 21, 1882. (No model.)

To all whom it may concern Be it known that I, ELAM RAKESTRAW, ofCambridgeport, in the county of Suffolk and.

beans can pass, each screen being provided.

with a chute for carrying olf the beans that have passed through thescreens, which chutes can be so combined by means of pivoted gates insome of the chutes that the round and hat beans can be separated fromeach other 5 or the vchutes can also be adjusted to separate the roundand flat beans and to divide these round and flat beans into portions orgrades, according to the size of the beans, all as will be fullydescribed hereinafter, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a longitudinal sectional elevation of my improvedco'ee-grader. Fig. 2 is a plan view of the same, parts being broken out.Fig. 3 is a sectional plan view of the saine on the line Fig.v 1. Fig. 4is a sectional plan view of the same on the line y y, Fig. 1. Fig. 5 isa sectional plan view'on the line z z, Fig. 1. Fig. 6 is across-sectional elevation of the same on the line so' x', Fig. 1. Fig. 7is a longitudinal sectional elevation on the line y' y', Fig. 6. Fig.Sis a cross-sectional elevation of the same on the line z' z', Fig. 2.

The shoe A, containing the screens for cleaning and gradingthe coi'ee,ishung in theframe A' by means of arms B, pivoted to the shoe A and to theframe A', so that the shoe can be reciprocated'. The shoe A is providedat one end (which will be designated throughout the specification as therear end") with a projecting arm, C, and this arm is provided with anaperture, a, containing an eccentric, b, mounted on a shaft, 0,..journaled in the frame A', and

1 provided .with ally-wheel and belt-pulley. If

the shaft c is rotated, the shoe A will be reciprocated or moved forwardand backward by the eccentric b. f The frame A' is provided on its topand at the front end with a hopper, D,

, into which the coffee to be cleaned and graded is passed, from whichhopper D the coffee beans or berries fall upon the screen E at the frontof the top of the box A. Stones, sticks of wood, Snc., cannot passthrough the screen qberries pass over the screen F upon the board F2,and thence on the screen G, slightlyinclined from the front to the rearof the shoe A. The

smallest berries pass through the apertures in the screen Gr and fallupon a board, G', below the screen G and aboutparallel with the same,down which board G' these beans slide and fall upon a screen7 H,inclined from the rear toward the front of the shoe A, which screen H isprovided with transverse slots, as shown in Fig. 3. The round beans cannot pass through these slots, and hence pass over the screenantloveraboard,0',at thefrontend ofthe same, and then drop off the edgeof this board and slide down the inclined chute h in the front of theshoe, and from chute h slideinto a chute, I, under the shoe A, and passthrough an opening, I',in this chute into a chute, 7L', projectingsidewise from the frame A' below the shoe A. The flat beans pass throughthe'slots of the screen H and fall upon a board, H', below and aboutparallel with the screen H, and from the lower end of this board H' theat beans slide down a chute, i, at the front end ofthe shoe, and thenslide down by suitable connection into a chute, J on the bottom of theshoe,and through an opening, J in the chute J pass into a chute, Q,projecting sidewise from lthe frame A' below the shoe A. The beans thathave passed over the 'screen G drop down at thelower end of the sameupon a screen, L, below the board H'. The smaller beans fall through theapertures-of the screen L upon a board, L', below it, and slide downthis board L and fall upon a screen, M, provided with transverse slots,through which the flat beans fall upon a board, M', below the screen M.The round beans cannot pass through the slots ofthe screen M, and passover this screen, and at the end of the same slide down an inclinedchute, m, at the rear end of the shoe A, the lower end of this chute mbeing in communication with a chtite, m', projecting from the rear endof the shoe A, this chute m being at the rear end of the bottom chute I.The dat beans that have passed through the slots of the screen M slidedown board Ml into a chute, Z, the lower end of which is incommunication with a chute, l', projecting from the rear of the shoe A,this chute l being at the rear end of the bottom chute J. The beans thathave passed over the screen L fall from the lower end of the same upon ascreen, N, over which the larger pass, the small beans passing throughthe apertures of the screen N upon a board, N', below it, and from theend of this board N fall upon a screen, O, provided with transverseslots. The lat beans fall through the slots of the screen O upon thebottom P of the shoe A, and by the two strips 7c are conducted throughan opening, j, at the front end ofthe bottom P into a chute, o', andfrom there to the chute K, projecting from the side of the frame A belowthe shoe A, the inner end of this chute being in communication with theinner end of the chute Q. The round beans which cannot pass through theslots of the screen O pass from the end of this screen through a chute,n, leading to a chute, p, at the front end of the boX, this chute pbeing in communication with the front end of the bottom chute I. Thebeans that pass over the screen N fall from the end of the same upon thebottom P of the shoe A, and also pass oft' through the chutes o K.

A valve or gate, It, is pivoted in the front end of the chute I, and bymeans of this gate the coffee passing down the chute n can be conductedinto the chute p or into the chute I. A valve or gate, S, is pivoted inthe rear end ofthe chute I, and by means of it the coffee passing downthe chute m can be conducted into the chute m or into the chute I. Thechute J is provided at its rear end with a piv oted gate, T, by means ofwhich the coiee passing down the chute l can be conducted into the chutel or into the chute J.

The inclined bottom of:l the chute K is provided with a valve, U, bymeans of which a communication can be established between the chutes Kand Q, as shown in Fig. 8. The chutes K and Q are provided with gates WW at the sides of the bottom of the shoe A, which gates W 'are opened toadjust the gate U. The smallest round beans pass through the chute h.The smallest flat beans pass through the chutes t' and J into the chuteQ. The second grade of round beans pass through the chutes m and m. Thesecond grade of flat beans pass through the chutes l and l. The

third grade of round beans pass through the chutes n and p. The thirdgrade of flat beans pass through the chutesj and o into the chute K. Thecoffee filled into the hopperD is thus divided into six grades. It' thechutes p and m are closed by means of the gates R and S, the second andthird grades of .round berries will be conducted into the chute I, andall the round berries of the different sizes pass through the aperture Iof the chute I into the chute h'. If the chute l is closed by the gate Tand the gate U in the bottom ot' the chute K is closed, all the datbeans will be conducted through the aperture J into the chute K. Thismachine can thus be used to separate the flat from the round beans, andat the same time it can be used to assort the flat or the round beansaccording to size.

The slots in the screens H, M, and O are made slightly narrower than thediameter of the apertures in the respective screens G, L, and N, fromwhich they receive the coffee, whereby, as by thereciprocatin g motionof the shoe A the dat beans are turned up edgewise on reaching theslots, the flat beans fall through the screens G L N and the round beanspass on and over the lower` ends of said screens.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a coffee-grader, the combination, with a reciprocating shoe, A, ofthe screens G, H, L, M, N, and O, the chutes h, t', l, and m in the shoeA, the chutes I, J, and o on the under side of the same, and the chutesIt', K, and Q on the frame of the shoe and below the shoe, substantiallyas herein shown and described, and for the purpose set forth.

2. In a coffee-grader, the combination, with a reciprocating shoe, A, ofthe screens G, H, L, M, N, and O, the chutes h, i, 1,11., and m in theshoe A, the chutes I and J, the chutes m', l', and p, and the gates R ST, pivoted in the chutes I and J, substantially as herein shown anddescribed, and for the purpose set forth.

3. In a coffee-grader, the combination, with a reciprocating shoe, A, ofthe screens G, H, L, M, N, and 0, the chutes h, v1, l, a, and min theshoe A, the chutes I, J, and o', and the chutes K and Q, and the hingedgate U in the inclined bottom ot the chute K, substantially as hereinshown and described, and for the purpose set forth.

4. In a codec-grader, the combination, with a reciprocating shoe, A, ofthe screens G, H, L, M, N, and O, and the corresponding chutes forcarrying off the different grades of coffee, the screens E and F, thechutes e and f, and the hopper D, substantially as herein shown anddescribed, and for the purpose set forth.

ELAM RAKESTRAW.

Witnesses:

JOHN C. MASON, F. P. TUCKER.

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